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Neurologic Disorders of the Larynx and Videostroboscopy. Stephanie Cordes, MD Anna Pou, MD April 1998. Introduction. scientific and technological advancements improvements in diagnosis of voice disorders better understanding of laryngeal function

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neurologic disorders of the larynx and videostroboscopy

Neurologic Disorders of the Larynx and Videostroboscopy

Stephanie Cordes, MD

Anna Pou, MD

April 1998

  • scientific and technological advancements
  • improvements in diagnosis of voice disorders
  • better understanding of laryngeal function
  • laryngeal mechanism subject to highly complex, extensive neural control
  • mostly a neglected topic
anatomy of phonation
Anatomy of Phonation
  • functions as biological valve for phonation, respiration, and swallowing
  • lies between the 3rd and 6th cervical vertebra
  • arises from paired branchial arches III, IV, and VI
  • development begins during third week of embryonic growth
anatomy of phonation4
Anatomy of Phonation
  • unpaired cartilages :thyroid, cricoid, and epiglottis
  • paired cartilages :arytenoids, corniculates, and cuneiforms
  • intrinsic muscles :cricothyroids, posterior cricoarytenoids, lateral cricoarytenoids, transverse arytenoid, oblique arytenoids, and thyroarytenoids
  • extrinsic muscles :strap muscles
anatomy of phonation5
Anatomy of Phonation
  • innervation by vagus
  • superior laryngeal nerve :internal and external branches
  • recurrent laryngeal nerve :anterior and posterior branch
  • blood supply :superior and inferior laryngeal artery
  • vocal fold arrangement - mucosal wave
physiology of phonation
Physiology of Phonation
  • begins in cerebral cortex
  • precentral gyrus to motor nuclei then coordinated activity
  • phonatory cycle :
    • vocal folds approximated
    • infraglottic pressure builds up
    • pressure opens folds from bottom up
    • upper portion with strong elastic properties
parameters of voice
Parameters of Voice
  • quality, loudness, and pitch
  • quality :depends on symmetrical vibration at the midline of the glottis
  • loudness :influenced by subglottic pressure, glottic resistance, transglottic air flow, and amplitude of vibration
  • pitch :alterations in length, tension, and cross-section mass of folds
patient evaluation
Patient Evaluation
  • review of history and comprehensive exam
  • history to include -”I MADE A SPEECH”
    • Impressions of Dysphonia
    • Medical /Surgical History
    • Abusive Voice Patterns/Allergies
    • Dysphagia/Aspiration
    • Esophageal Reflux
patient evaluation9
Patient Evaluation
    • Auditory Acuity
    • Shortness of Breath/Stridor/Speech Difficulties
    • Patient’s Perceptions of Voice Difficulty
    • Emotional Status of Patient
    • ETOH Consumption and Tobacco Use
    • Clearing the Throat and Coughing
    • History of Voice Difficulty
patient examination
Patient Examination
  • ears - hearing acuity
  • conjunctiva - allergies, anemia, jaundice
  • nose - obstruction
  • oral cavity - dental patterns, xerostomia, enamel
  • neck - thyroid and muscle tension
  • cranial nerve - gag reflex, palatal deviation
  • laryngeal exam - IDL
  • allows routine, slow-motion evaluation
  • detect vibratory asymmetries, structural abnormalities, submucosal scars
  • illuminates different points on consecutive vocal folds
  • desynchronize light and frequency of vocal fold vibration
neurologic voice disorders
Neurologic Voice Disorders
  • Flaccid neural
  • Spastic neural
  • Ataxic neural
  • Hypokinetic neural
  • Hyperkinetic neural
  • Mixed neural
  • Vocal tremors
  • Spastic Dysphonia
flaccid neural disorders
Flaccid Neural Disorders
  • damage or disease to component of motor unit causing laryngeal muscle paralysis
  • type and extent depends on lesion site
    • bilateral complete - total weakness, aphonic
    • bilateral incomplete - partial, SOB, fatigue
    • bilateral recurrent - abductor paralysis, median
    • unilateral recurrent - hoarse, breathy voice
  • Myasthenia Gravis
myasthenia gravis
Myasthenia Gravis
  • autoimmune disease with reduced availability of Ach receptors
  • severe muscle deterioration
  • inhalatory stridor, breathy voice, hoarseness, flutter, and tremor
  • decreased loudness
  • restriction in pitch range
  • dysphagia, VPI, hypernasality
spastic neural disorders
Spastic Neural Disorders
  • unilateral or bilateral upper motor neuron damage, release of inhibition
  • hyperadduction of true and false cords
  • low-pitched voice with little variation in loudness or pitch
  • strained-strangled voice, periodic arrests
  • prolonged glottic closure, hyperactive supraglottic activity, retarded wave
ataxic neural disorders
Ataxic Neural Disorders
  • follows cerebellar damage
  • typically struggle with uncontrolled loudness and pitch outbursts
  • mild to moderate tremors of laryngeal inlet during phonation
  • vocal folds without anatomic abnormalities
  • usually has accompanied dysarthria
  • Friedreich’s Ataxia
hypokinetic neural disorders
Hypokinetic Neural Disorders
  • related to Parkinson’s Disease
  • depletion of dopamine in substantia nigra
  • reduced loudness, monopitch, breathy, rough, hoarse, tremorous
  • widespread hypertonicity and rigidity
  • recruitment of ventricular folds not uncommon
hyperkinetic neural disorders
Hyperkinetic Neural Disorders
  • associated with EPS, Huntington’s Chorea
  • loss of neurons in caudate nucleus
  • irregular pitch alterations and voice arrests
  • hypotonic limbs and respiratory muscle incoordination
  • inappropriate loudness variations
  • harsh, strained-strangled quality
mixed neural disorders
Mixed Neural Disorders
  • damage or disease to multiple subsystems
  • ALS -flaccid and spastic, depends on lesion
  • dysphagia, airway obstruction
  • harsh quality, hypernasal, variable pitch
  • restricted intensity, breathy, stridor
  • MS - spastic and ataxic
  • impaired loudness control, harsh, breathy
  • inappropriate pitch and rate
vocal tremors
Vocal Tremors
  • essential tremor most common disorder
  • head and hands involved, +/- voice
  • cause unknown
  • quavering or tremulous speech, most noticeable on vowel prolongation
  • pitch breaks and voice arrests
  • larynx moves at rest and during phonation
  • predominant involvement of TA muscles
spastic dysphonia
Spastic Dysphonia
  • unknown cause - psychogenic or neuromuscular
  • three forms - adductor, abductor, mixed
  • adductor most prevalent
  • strained-strangled quality, periodic arrests
  • limited pitch and volume control
  • prolonged vocal fold closure and reduced amplitude of vibration
  • surgical :NSGY or laryngeal surgery
  • medical :drugs that treat the motor symptoms
  • speech pathology :behavioral treatment
  • use of augmentative or alternative communication devices
case report
Case Report
  • 72 y/o male with 12 mo. h/o progressive dysphonia
  • signs and symptoms of Parkinson’s
  • referred by neurology for speech difficulties and occasional aspiration of thin liquids
case report24
Case Report
  • 38 y/o female with 6 mo h/o strained-strangled voice, worse over past two months
  • 20 pack year history of smoking
  • h/o heroine and cocaine addiction
  • intermittent arrests in phonation, lapsed into whispered speech patterns
case report25
Case Report
  • 55 y/o female with h/o CVA 18 mo ago that resulted in dysarthria w/o apraxia or aphasia
  • CT - hypodense lesion in internal capsule
  • MRI - infarct in right anterior corona radiatum
  • speech unintelligible
  • imprecision, hypernasal, strained-strangled